import { constantRouterMap } from '@/router';

/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param rightList
 * @param route
 */
function hasPermission(rightList, route) {
  if (route.meta && route.meta.right) {
    return rightList.some(right => {
      return route.meta.right.indexOf(right) >= 0;
    });
  } else {
    return true;
  }
}

/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param asyncRouterMap
 * @param rightList
 */
function filterAsyncRouter(asyncRouterMap, rightList) {
  if(!asyncRouterMap){
    asyncRouterMap = constantRouterMap;
  }
  const accessedRouters = asyncRouterMap.filter(route => {
    if (hasPermission(rightList, route)) {
      if (route.children && route.children.length) {
        route.children = filterAsyncRouter(route.children, rightList);
      }
      return true;
    }
    return false;
  });
  return accessedRouters;
}

const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: []
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers;
      state.routers = routers;
    }
  },
  actions: {
    GenerateRoutes({ commit }, data) {
      return new Promise(resolve => {
        const rightList = data.rightList;
        let accessedRouters;
        accessedRouters = filterAsyncRouter('', rightList);
        commit('SET_ROUTERS', accessedRouters);
        resolve();
      });
    }
  }
};

export default permission;
